To understand why the voltage level is not the sole perspective determinant of potential injury due to electrical shock, consider the case of a static electricity shock mentioned in the Practical Perspective at the start of this chapter. When you shuffle your feel across a carpet, your body becomes charged. The effect ot this charge is that your entire body represents a voltage potential. When you touch a metal doorknob, a voltage difference is created between you and the doorknob, and current flows—but the conduction material is air, not your body!
Suppose the model of the space between your hand and the doorknob is a 1 MΩ resistance. What voltage potential exists between your hand and the doorknob if the current causing- the mild shock is 3 mA?
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